Harrow



(No Model.)

W. W. ROBINSON.

- HARROW.

No. 308,433. Patented N. 25. 1884.

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SPECIFICATION forming part of Letters Patent No. 308,433, dated November25, 1884.

Application filed June 27, 1884. (No model.) 7

.To all whom it may concern.-

Be it known that I, WILLIAM WV. ROBIN- soN, of Odebolt, in the county ofSac and State of Iowa, have invented certain new and useful Improvementsin Harrows, of which the following is a full, clear, and exactdescription.

This invention relates to harro-ws in which the teeth are carried byrocking beams under control of a lever to change the angular position ofthe teeth relatively to the ground; and it consists in a novelconstruction of the beams, and the means used to secure the teeth on thebeams, also the means for carrying the beams and connecting them withthe devices by which they are rocked, substantially as hereinafterdescribed. I

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 represents a top view of a portion of a harrow embodying myinvention Fig. 2, a partly sectional side view of the same; and Fig. 3,a rear view upon a larger scale of one of the harrow-teeth, with aportion of a piece of pipe forming one ofthe rocking beams, and a clipby which the tooth is secured to said pipe or beam.

A A are the rocking beams, of tubular construction, being composed ofpieces of pipe, whereby lightness is combined with strength. Said pipesA A, of which there may be any number arranged one in rear .of theother, are fitted to turn or work in boxes B B, bolted to their placesat suitable distances apart within a doubled bar or strap support, 0, oneach side of the harrow. The teeth D are secured to these pipes in theirrear by metal clips E, constructed and arranged to hug the pipes fromtheir front sides, and having a backwardly-projecting under jaw, I),which forms a lower bearing for the shanks of the teeth, aneye-tightening bolt, d, passing through the upper end portion of theclip, and secured by a nut from the front side, forming the upperbearing for the tooth-shank. The tightening up of the bolts (Z causesthe clips E to firmly hold the teeth by their shanks up against the rearsides of the pipes A, and the clips E are locked or prevented fromturning on the pipes by an inner teat or projection, e, on each clip,

side of the pipe, as shown at the right hand of Fig. 2 for a clip havinga reversed position on the pipe, but otherwise of the same construction,and which is used as a connecting means for rocking the pipe, each ofthe pipes entering an indentation or perforation in the A being providedwith a similarly-arranged clip, E, in the center of its length for rodsf to enter down within the jaws and eyebolts of said clips, which rodsare connected above with a bar, that is moved backward-0r forward by alever, G, to rock or turn the several pipes for the purpose of varyingthe angular position of the teeth relatively to the ground, as required.The other reversely-arranged clips E, which carry the teeth instead ofbeing in line with one another, as in case of the clips for rocking thepipes, are dis posed and secured, as described, on the pipes instaggering relation with each other, to give the teeth their properdistribution over the harrow. The shanks s of the teeth D are made ofsufficient length to set the teeth up or down as required, and ofrounded construction to permit of the teeth being turned in theirclip-bearings when the clips are released for the purpose. The teeththemselves-that is, their bodies or working parts h-are of a flatconstruction, chamfered on their opposite edges, as at 'i i, (see Fig.3,) whereby said teeth, accordingly as they are turned or adjusted intheir bearings in the clips, may be made to present either a broad flatworking-surface or a knife-edge in front, or may be set to present anoblique workingface to suit different requirements of the soil or workto be done, and said teeth having opposite fiat sides and oppositeknife-edges, their working-surfaces 0r edges may be reversed or changedas required, whereby the durability of the teeth is increased. In Fig. 2one of the teeth is shown by full lines as presenting a broad frontworking-surface, and by dotted lines as turned to present a knifeedge.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is 1. The rocking beams composed of pipes A,in combination with the boxes B and strap 7 supports 0, the clips E,with their tighteningeyebolts d, the rods f, and the lever G, the

3. The combination of the barrow-teeth D, having rounded shanks, theclips E, having a lower perforated jaw, b, and upper tightening-eyebolt,d, and the rocking beams or 15 pipes A, substantially as specified.

WILLIAM W. ROBINSON.

Vitnesses:

W A. HELSELL, FRANK W. BENNETT.

